refactor: remove passkey login

db/migrations.py

@@ -909,31 +909,7 @@ def _migrate_to_v20(conn):
 
 
 def _migrate_to_v21(conn):
-    """迁移到版本21 - Passkey 认证设备表"""
-    cursor = conn.cursor()
-
-    cursor.execute(
-        """
-        CREATE TABLE IF NOT EXISTS passkeys (
-            id INTEGER PRIMARY KEY AUTOINCREMENT,
-            owner_type TEXT NOT NULL,
-            owner_id INTEGER NOT NULL,
-            device_name TEXT NOT NULL,
-            credential_id TEXT UNIQUE NOT NULL,
-            public_key TEXT NOT NULL,
-            sign_count INTEGER DEFAULT 0,
-            transports TEXT DEFAULT '',
-            aaguid TEXT DEFAULT '',
-            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-            last_used_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
-        )
-        """
-    )
-    cursor.execute("CREATE INDEX IF NOT EXISTS idx_passkeys_owner ON passkeys(owner_type, owner_id)")
-    cursor.execute(
-        "CREATE INDEX IF NOT EXISTS idx_passkeys_owner_last_used ON passkeys(owner_type, owner_id, last_used_at)"
-    )
-
+    """迁移到版本21 - 旧认证设备功能已移除，保留版本号兼容历史数据库。"""
     conn.commit()